Early this season I bought 330 yds of 4# PLine & spooled it on the reel I use most for UL fishing. For the past several seasons I've used the 10# version of this line on 2 reels I use for bass fishing and have found it to be excellent. Like fluoro, it's invisible in the water and lacks the annoying line memory of pure fluoro.
But - and here's the rub - the same doesn't apply to the 4# version. First, it isn't as strong as popular monos like Stren or Trilene nor is as abrasion resistant. Worst of all, it's way too susceptible to line memory. While it's really thin (almost too thin for folks with old eyes) and casts like a dream, the line memory tends to create huge birds nests far too often.
I suspect it's due to its thinness. In heavier weight lines the copolymer core keeps the fluoro from exhibiting its worst attributes but when it gets down to 4# there's not enough of the core to counteract the line memory.
So my advice is if you're considering PLIne Fluorclear stay with the heavier versions.
Keep calm and fish on...
There's a fine line between fishing and just sitting there looking stupid